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How many working days in year 1964?
Here is the detail of the calculation:
Because 1964 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 255 working days in 1964.
 Here is the list of these 7 public holidays: 
 
 1. New Year's Day : Wednesday, 1 January, 1964 
2. Epiphany : Monday, 6 January, 1964 
3. Easter Monday : Monday, 30 March, 1964 
4. Labour Day : Friday, 1 May, 1964 
5. Corpus Christi : Thursday, 28 May, 1964 
6. Independence Day : Wednesday, 11 November, 1964 
7. Christmas Day : Friday, 25 December, 1964 
And here are the 6 public holidays falling on a weekend:
1. Easter Sunday : Sunday, 29 March, 1964 
2. Constitution Day : Sunday, 3 May, 1964 
3. Pentecost Sunday : Sunday, 17 May, 1964 
4. Assumption of Mary : Saturday, 15 August, 1964 
5. All Saints' Day : Sunday, 1 November, 1964 
6. Boxing Day : Saturday, 26 December, 1964